Steam-boiler.



M. W. SEWALL.

STEAM BOILER.

APPLICATION FILED APB.5, 1910.

INVENTOR Patented Aug. 13, 1912.

WITNESSES:

AATTORNEYG UTED sraras PAT oration.

MINOTT w. SEWALL, or new YORK, N. Y., ASSIGNOB. TO THE Bassoon & wxncox COMPANY, or BAYONNE, NEW JERSEY, A CORPORATIQN or NEW JERSEY.

STEAM-BOILER.

Specification of ietters Patent.

Patented Aug. 13, 1912.

Application filed April 5, 1910. Serial No. 553,578.

the county of New York and State of New York, have invented certain new and useful Improvements in Steam-Rollers, of which the following is a specificat1on.

My invention relates toe-steam boiler or generator of that type having water tubes in substantially vertical banks and upper and lower horizontal drums, and more particularly to the construction and arrangement of a superheater to be used therewith.

The inlventionwill be understood from the following description taken in connection with theaccompanying drawings in which- Figure 1 is a vert-ical section through a portion of a boiler showing thev disposition of the superheater therein, and Fig. 2 a top View.

Similar reference numerals indicate similar parts in the several views.

- Referring to the drawings, the numeral 1 designat-esthe furnace, 2 the bottom drum, 3 the top or steam and water drum, and 4: the vertical connecting tubes, it being understood that theboiler comprises two or more banks of similar tubes with the drums connected together in a well-known manner, the upper drum 3 of the second bank being shown in Fig. 2. To meet the want of a satisfactory supcrheater for this type 'of boiler I provide an upper boX or manifold 5 to which the steam supply pipes Gare connected. .The box 5 is placed above and may be supported upon one ofthe steam and Water drums in any convenient way and is divided into two parts by a transverse partition 7. Into the box 5 are expandedsuperheating tubes 8 curved at their upper ends and their longer legs extending downwardly with the lower ends expanded into a box or manifold 9 lying in a direction parallel to that of the box 5. As shown in the drawings, the box 5 is'prcferably placed above the steam drum of the front bank'of tubes, and the box 9 directly above the rear of the furnace root.

The front wall of the furnace is built up of tire bricks 1O partially inclosing the tubes 8, and an outer covering of asbestos and metal plates 1], the wall bcin; supported by said tubes. The brickwork inclosing the tubes extends from the lower manifold i to the roof of the boiler and the metal plates 11 may be supported upon the furnace roof. The lower portions of the tubes 8 may be protected by a fire-brick wall 12 extending from the furnace roof a suitable distance, as shown in Fig. 1. r In the operation of the boiler the steam passes through the supply pipe 6 into one of the chambers of the upper box. formed by the partition 7, thence down thesuperheating tubes 8 leading from said chamber to the lower box 9, and thence upwardly through the tubes 8 which are expanded into the box 5 on the opposite side of said partition, from which part of the box it may pass outthrough flange 13. 7

As shown in Fig. 1, I provide a battle wall 14 to cause the gases to pass upward longitudinally of the front bank of tubes and into contact with the upper portions of the super-heating tubes,'then e across and down through the second bank of tubes following the course usual in this type of boiler. By placing the superheating tubes in the front wall of the boiler I am enabled to provide this type of boiler with a satisfactory superheater which has not heretofore been possi ble owing to the setting of the tubes and drums. It will also be noted that the furnace opens directly into the first pass, and that the superheating tubes are so located as to be exposed to the hottest part of the flame.

As before stated, in the type of boiler shown by me the steam drums are connected in a well-known manner, that is the steam from all of the drums is collected in one of the drums from which it drawn. I have modified such usual arrangement in the pres' ent construction by providing a steam colletting box 15 connected to the drum 3 by a series of short nipples It the steam piisS- ing from the box 15 through the. pipe i' to the upper manifold 5.

What l claim and desire to secure by Letters latcnt of the llnitod States is: v

A steam boiler comprising a furnace, a bank of vertical heating tubes, lower and upper drums into which said tubes are expanded. a horizontal manifold supported above the upper drunn.steam-supply pipes and supcrhcating tubes connected to said manifold. said superhcating tubes extending dmvnuardlr in proximity to the heating tube and serving as a support for the front casing, a s cond manifold in whirl. the lower ends of said superheating tubes are expandsigned my name in the presence of two subed, said last-named maniiold being sFpportscribing witnesses.- 1 ed above the rear of the urnace 1'00 and a Y refractory covering for the lower ends of the 4 MINOTTJ: A 5 superheating tubes extending upwardly Witnesses:

from the lower manifold. HUGH MoDoUGALL, In testimony whereof I have hereunto EUGENE P. TERRY. 

